EUVD-2026-13838
GHSA-jph4-mv6f-wg9x
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Lifecycle Timeline
3Description
The Autoptimize plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'ao_post_preload' meta value in all versions up to, and including, 3.1.14. This is due to insufficient input sanitization in the `ao_metabox_save()` function and missing output escaping when the value is rendered into a `<link>` tag in `autoptimizeImages.php`. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page, granted the "Image optimization" or "Lazy-load images" setting is enabled in the plugin configuration.
Analysis
A Stored Cross-Site Scripting (XSS) vulnerability exists in the Autoptimize WordPress plugin through version 3.1.14, caused by insufficient input sanitization in the ao_metabox_save() function and missing output escaping when rendering the 'ao_post_preload' meta value into HTML link tags. Authenticated attackers with Contributor-level access or higher can inject arbitrary JavaScript that executes whenever users access pages with the Image optimization or Lazy-load images settings enabled, potentially affecting all users of compromised sites. …
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Remediation
Within 30 days: Identify affected systems running all and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.
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External POC / Exploit Code
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